如何在Laravel中测试从Notification发送的邮件

use Illuminate\Notifications\Notification;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Support\Facades\Notification as NotificationFacade;
use Tests\TestCase;

class EmailNotificationTest extends TestCase
{
    public function testEmailNotification()
    {
        NotificationFacade::fake();

        $user = User::find(1);

        $user->notify(new WelcomeNotification());

        NotificationFacade::assertSentTo(
            $user,
            WelcomeNotification::class,
            function ($notification, $channels, $notifiable) {
                return in_array('mail', $channels) &&
                    $notification->toMail($notifiable)->subject == 'Welcome to our website';
            }
        );
    }
}

class WelcomeNotification extends Notification
{
    public function via($notifiable)
    {
        return ['mail'];
    }

    public function toMail($notifiable)
    {
        return (new MailMessage)
            ->subject('Welcome to our website')
            ->line('Thank you for signing up!')
            ->action('Visit Website', url('/'));
    }
}